Domestic cooker



June 30,1925; r 1,544,274

A. SAXEGAARD I DOMESTIC COOKER Filed Feb. 14. 1924 Patented June 30,1925.

UNITED stares ANDREAS SAXEGA RD} or oH'nIsTIANrA, NORWAY.

Application filed-"Eebruary T a;ZZ' wiiom it may; concern; i

B'e itlmoWn that L'ANDR'EAS: SAXEGAARD; a subjectof the King: oi-Norway, residingat Middelthunsg ate 1 7, Ghristiania Norway,

5 have invented certain new and useful Imat suitable temperature byelectric means,

being used as a heat reservoir.

The invention is however also to some degree applicable in cases whereanother source o-fheat is used; for inst'aiice gas or oil. I shallhowever in the following mainly describe the invention as' it is usedwhen; electric 1 heating meansareapplied:

The invention has" for its object improvements whereby the transmissionof heatfrom the electrical heating elements to the wa teris: automati'cally' regulated according to the temperatureheldby the water atany time; and also'automatic regulating means whereby the source'ofheatis out out, when the temperatureof the waterhas been raised to themaximum temperature required,

My: invention also comprises the idea of combining: with" the water bathserving as a-heat acci'l'niula-tor, a heat accumulator consisting ofsolid body capable ofbeingraised to a temperature higher than theboiling point of water.

As the invention, as -it willbe'understoodfro'in tlie above; isapplicable in connection withdiflerent kind i of cookers-5'1 have shownin the drawing only examples of its appli cation in different cases=and" not complete drawings of. cookers as they should-be co'nstruc-ted.Thereby the" description of the invention. is simplifiedand tlieunderstandin'g of the sam'eis rnade easier; I

In the drawings F igs; 1' is a vertical section' of a domestic cooker,in which cooker the principles ofmy invention has beenap'pliedon acooker ofthe'typeshown in 14-; 1 924; semi" no ceases.

' my U. S. Patent No. 1,471,573.

a vertical; section of 'amodified for-m of the cooker shown in Fig. 1;-lhe heating apparatus shown in-th'e' drawing, is in this instance anelectrical heater'in which heat is" accumulated in a metalybody.

In' thedr awingE designates the water reservoir of the cooker, F theoven shown in Fig; 1* formed within abody: A} whichmay consist ofmetalor any other suitableinate- 6 rial. Imbedded this body- A; is anelec trical heating element, or elements A; 'T he bod A- is" Iiooin:direct contact with-the water in'thereservoir E,; butis placedwithin atubular body B- of the same shape as that a space D is-fo-rmed betweenthe body A- and the body 13;; At its lowest point, this space hasopenings G throughflwhich itcomin'unicates iwith the-water inthereservoir.= The functionof this device is as follows? i l j J I g Thespace D is normally filled with;

(ill

"0 the body A,' but of greater diameter so waterl Whenthe'bodyA-isbeingwarmed byithe; electrical elements, this heat-servesnoto'nlylt0 keep the oven F ata suitable;

i temperature, but-theheat is also-transferred through the water space Dto the i water in t-heArese-rv-o-ir E. W hen" the" wateri-n thereservoirhas reached a temperature not far from the 'boilingpointg-steanrwill be'createdin the space D- a'nd'this steam'will'by andby expelthe water from the" space-,tlirou 1r the openings G. The space Dwill then on y contaln steam and this steamwillserve as aheat insulatorbetween the body A and the water in the resenvoin The supply ofelectrical-energy to the electrical heating elements in the! body A,-can now be cut off for aconsiderable time withouteputting the 'cookeroutof operative condition. The-body A *which mayhave. attaineda-teinperature cit-L009 Q will for along tiniekeep the water at asuitable teIn-' perature-for the cooking-aud os soon asthe 1 temperatureof the water commences 'to fall steam willcondense within the space Dandthis will'cause watertoagain-enter the space I) through; the openings(3,-so th-a-t theconduction of heat from A to; willjagain be increased.

h It willbe understood that this part; ofthe inventionnow' having beendescribed; .is not necessar ly combined with the't'ormi'ng of a space Fservingas oven within the body I til) falls.- 3 I r 4 r In thismodification the solid body A se rv-. ing as an accumulator of heat,supplied to t tem'peratureof the water 'in the reservoir 4 i willautomatically' be kept near the boiling The said'body A may. be a solidbody and the oven F arranged at another point in the cooker as shown inFig. 2-

'i The important point in this part. otthe invention is the combined useof a; solid body and aliquid body asheat accumulators,

in such way that the heat accumulated in the solid body (for instanceduring night time) is. automatically transferred to the water reservoiras the temperature of the latter through the electrical heatingelements, is

enveloped'in a double water mantle there being two concentricwaterspaces formed around the body, by1 way of the two tubular casingsG, H. Both of these casings have openings I, K at their lowest pointthrough which theycommunicate with the surrounding Water reservoirE-This device acts-in the following manner. 'Vh'en the body A transmit-tedto the water reservoir that the latter is getting hot, the temperaturemthe water space nearest the body will reach the boiling 'point,steamiscreated and the water,

expelled from the space. The latter will then act asahinsulator andit-will take considerable time beforethe body has attained a temperaturesufliciently high 'to form steam in the exterior Water space.

hen this'occurs, also this space will be.

filled with steam and both spaces will now act asa-n insulator, so thatthe solid-body serving to accumulate heat can come up'to'aconsiderablehigh' temperature, before the trans mission ofheat from itto the water 'reservoir-will'be suflicient to cause evaporation; Thecooker will now be loadedwithheat for a" long 'run 'and during use thepoint, the two watersp'aces around the hot body successively taking upwater as the temperature of-the waterin the Water reservoir and thetemperature of the heat accumulator sinks.

What Iclaimis:

1. In a-domest'ic cooker,[a liquid reservoir serving as ai-heataccumulator and as a means to. transfer heat to cooking vessels, :1 bodyimmersed in the liquid'adapted to serve as a holder for, heatingelements and to transfer heat totheliquid, and a casing enveloping saidbody having auopening therein successively constltutlng a-n inlet andexit for the liquid under varying temperatures'of said body."

2. Ina domestic cooker, a water-reser voir, a body immersedin the water,heating elements in the body,-a casing enveloping said body and co-operating with the latter toiorm a chamber, said casing having an hasreached a high temperature and so much heat has been opening throughwhich the chamber communicates with the reservoir whereby water 1 issuccessively admitted to and expelled from the chamber undervaryingconditions of" temperature. I

3 3. Ina domestic cooker, a water reservoir, a body immersed in thewater having sufli cient volume to serve as a primary accumu- "lator ofheat, heating elements in said body,-

a casing surrounding the latter f'orming a chamber and having an openingthrough which the chamber communicateswith the reservoir whereby water1S successively admitted to and expelled from the chamber under varyingconditions of temperature of a a heat accumulating body immersed in the'water,'a casing surrounding the body communlcatlng with-the reservoirthrough a] single openlng 1n the bottom of the casing and constitutingwater trap, around the body, and heating elements in the body adapted toheat the latter. sufliciently to con' vert the trapped water into steam.v 7 1 6. In a domestic cooker, a water reservoir,

water, a casing surroundingthe body communicating with the reservoirthrough a single opening in the bottom ofthe casing and constituting awater trap around the body, heating elements in the body adapted to heatthe latter sufliciently toconvert the trapped water into steam and acooking receptacle mounted in the reservoir.

7 In a domestic cooker, awater reservoir, a heat accumulating bodyimmersed in'the water of the reservoir, a casing. enveloping said bodyforming a chamber for the T6061)? 1 tion of water from the reservoir,heating elements in said body adaptedv to convert the water in thechamber into steam,fland an auxiliary casing surrounding the chamber andcommunicating with the latter and with the reservoir.

a heat accumulatingbody' immersed in the v 8. In a domestic cooker, awater reservoir,

a heat accumulating body immersed in the water of the reservoir, acasing communieating with the reservoir and forming a water trap aroundsaid body, an auxiliary casing communicating with the reservoir and w1ththe water trap, and heating elements in said body adapted to heat thelatter sufiEiciently to convert the'water in the trap into steam,whereby steam is generated Within the auxiliary casin 9. In a domesticcooker, a water reservoir, a heat accumulating body immersed in thewater of the reservoir, a casing forming an annular chamber around saidbody, and communicating with the reservoir through an opening at itslowest point, an auxiliary casing forming a concentric chamber aroundthe annular chamber and communicating with the latter and with thereservoir, and heating elements mounted in the heat accumulating bodyadapted to generate steam in the chambers.

10. In a domestic cooker, a water reservoir, a heat accumulating bodyimmersed in the water of the reservoir, a casing forming an annularchamber around said body and communicating with the reservoir through anopening at its lowest point, an auxiliary casing forming a concentricchamber around the annular chamber and communicating with the latter andwith the reservoir, and heating elements mounted in the heataccumulating body to generate steam in the annular chamber and in theconcentric chamber successively.

In testimony that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

ANDREAS SAXEGAARD.

Witnesses:

S. GULLICKSEN, GULBoRG GULBRANDSEN.

